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y(35)-42(20)+28(20)=0
We simplify the equation to the form, which is simple to understand
y(35)-42(20)+28(20)=0
Reorder the terms in parentheses
+(+35y)-42*(20)+28*(20)=0
Remove unnecessary parentheses
+35y-42+*(+20+)+28+*(+20+)=0
Reorder the terms in parentheses
+35y+(-840)+28*(20)=0
Remove unnecessary parentheses
+35y-840+28+*(+20+)=0
Reorder the terms in parentheses
+35y-840+(+560)=0
Remove unnecessary parentheses
+35y-840+560=0
We move all terms containing y to the left and all other terms to the right.
+35y=0+840-560
We simplify left and right side of the equation.
+35y=+280
We divide both sides of the equation by 35 to get y.
y=8
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